By Brianna Bailey Business Writer bbailey@oklahoman.com Standing in front of Bass Pro Shops store on a wet, chilly Black Friday morning, Willie Robinson sings to keep warm as much as he does to urge people to drop some cash into his red Salvation Army kettle. In a freezing drizzle, Robinson belted out "Frosty the Snowman" and "Winter Wonderland" over and over as he rang his Salvation Army-issued bell on Friday in front of Bass Pro Shops.